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Screw chiller and its control method and system

A technology of water chillers and control methods, applied in the direction of refrigerators, refrigeration components, compressors, etc.

Active Publication Date: 2022-01-28
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The embodiment of the present invention provides a screw chiller and its control method and system to solve the technical problem that the existing screw chiller cannot achieve zero-load output without shutting down

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  • Screw chiller and its control method and system
  • Screw chiller and its control method and system
  • Screw chiller and its control method and system

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0028] Considering that the existing screw chillers cannot realize the stepless adjustment of the output load of the chiller in a large range, or cannot realize the zero load output without shutting down. Aiming at the root cause of the above-mentioned technical problems, the present invention considers that a screw chiller can adopt a zero-load output and non-stop operation mode, and use the screw chiller to freeze the incoming water through the heat exchanger to adjust the temperature of the chilled outlet water. When the temperature reaches the set value, even if the output load of the compr...

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Abstract

The invention provides a screw chiller and its control method and system. The screw chiller includes: a condenser; a cooling water flow path, in which the cooling water flows through the condenser; an evaporator; a chilled water flow path, in which the chilled water flows through the evaporator; Heat exchange; the valve is used to adjust the flux of cooling water entering the heat exchanger; the sensor group is used to detect the cooling water outlet temperature, the chilled water inlet and outlet temperature; the controller is used to control the valve according to the cooling water outlet temperature and the chilled water inlet temperature And / or heat exchangers to regulate the outlet temperature of chilled water and adjust the output load of chillers. By adding heat exchangers and valves to the chiller, using the cooling water to adjust the temperature of the chilled water, the compressor does not need to be shut down, and the unit can also reduce the output load range, or even zero-load output, which solves the problem that the existing screw chiller cannot operate without The technical problem of realizing zero-load output in the case of shutdown.

Description

technical field [0001] The invention relates to the technical field of chiller control, in particular to a screw chiller and its control method and system. Background technique [0002] In some special occasions, the screw chiller has strict requirements on the load output adjustment range, and needs to realize 0% to 100% load stepless adjustment, or when the terminal load changes and the chilled water temperature rises, the unit needs to immediately increase the output load. [0003] At present, the load adjustment range of conventional screw chillers is 25% to 100%, and the use of refrigerant bypass can only expand the load adjustment range to 10% to 100%, and it is difficult to achieve 0% to 100% load output adjustment; [0004] During the operation of conventional screw chillers, the load output is generally adjusted by controlling the chilled outlet water temperature (or the chilled water inlet temperature). When the chilled outlet water temperature is lower than the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B1/047F25B49/02
CPCF25B1/047F25B49/02
Inventor 刘华龙忠铿罗炽亮王双亮吴宏择李莹
Owner GREE ELECTRIC APPLIANCES INC
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